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Issue 26, 2017

Metasurface integrated high energy efficient and high linearly polarized InGaN/GaN light emitting diode

Author affiliations

Abstract

We proposed and demonstrated an integrated high energy efficient and high linearly polarized InGaN/GaN green LED grown on (0001) oriented sapphire with combined metasurface polarizing converter and polarizer system. It is different from those conventional polarized light emissions generated with plasmonic metallic grating in which at least 50% high energy loss occurs inherently due to high reflection of the transverse electric (TE) component of an electric field. A reflecting metasurface, with a two dimensional elliptic metal cylinder array (EMCA) that functions as a half-wave plate, was integrated at the bottom of a LED such that the back-reflected TE component, that is otherwise lost by a dielectric/metal bi-layered wire grids (DMBiWG) polarizer on the top emitting surface of the LED, can be converted to desired transverse magnetic (TM) polarized emission after reflecting from the metasurface. This significantly enhances the polarized light emission efficiency. Experimental results show that extraction efficiency of the polarized emission can be increased by 40% on average in a wide angle of ±60° compared to that with the naked bottom of sapphire substrate, or 20% compared to reflecting Al film on the bottom of a sapphire substrate. An extinction ratio (ER) of average value 20 dB within an angle of ±60° can be simultaneously obtained directly from an InGaN/GaN LED. Our results show the possibility of simultaneously achieving a high degree of polarization and high polarization extraction efficiency at the integrated device level. This advances the field of GaN LED toward energy efficiency, multi-functional applications in illumination, display, medicine, and light manipulation.

Graphical abstract: Metasurface integrated high energy efficient and high linearly polarized InGaN/GaN light emitting diode

Supplementary files

Article information


Submitted
22 Jan 2017
Accepted
13 Jun 2017
First published
14 Jun 2017

Nanoscale, 2017,9, 9104-9111
Article type
Paper

Metasurface integrated high energy efficient and high linearly polarized InGaN/GaN light emitting diode

M. Wang, F. Xu, Y. Lin, B. Cao, L. Chen, C. Wang, J. Wang and K. Xu, Nanoscale, 2017, 9, 9104 DOI: 10.1039/C7NR00539C

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